Water-insoluble monoazodyestuffs and their production



Patented Aug.

entree stares PATENT orrics WArER-INsoLUBLE MONOAZODYESTUFFS AND THEIR PRODUCTION Aehille Conzetti, Basel, Switzerland, assignor to SerialNo. 699,303.

the firm J. R. Geigy S. A., Basel, Switzerland No Drawing. im utation November 22, 1933, In Germany November 28,

6 Claims. (Cl. 260-435) lacquers and acetyl cellulose lacquers, varnish lacquers, transparent metal lacquers, glass colors, coatings on films, wood, leather, metal, paper, glass, artificial masses, candles, fats and lubricating oils.

The invention is illustrated by the following eXamples:-

' Example 1 9.1 kilos of l-amino-4-ethoxy-2-nitrobenzene are diazotized in the usual manner and the diazosolution, after having been filtered, is allowed to run slowly into a solution, cooled with ice, of 12 kilos of 2,3-hydroxynaphthoic acid ethyl-ester, 350 kilos of ethyl-alcohol, 12 kilos of crystalline sodium acetate and 500 grams of glacial acetic acid. After coupling is completed, the dyestufi isseparated by filtration, washed with a little alcohol and much warm water and then dried. It dyes nitrocellulose and acetyl cellulose lacquers in pure and bright blue-red shades.

Example 2 9.5 kilos of 1-amino-2,4-dinitrobenzene are diazotized in the usual manner in nitrosyl-sulphuric acid. The whole is poured on to ice, filtered and the clear diazo solution so obtained is allowed to run at C. into a solution of 12 kilos of 2,3-hydroxynaphthoic acid ethyl-ester in 350 kilos of ethyl-alcohol. When coupling is completed, the dyestufi is filtered and washed first with ethyl-alcohol and then with warm water. It dyes lacquers pure red shades.

Example 3 7.6 kilos of 1-amino-l-methyl-2-nitrobenzene are diazotized in known manner and the filtered diazo-solution is allowed to run at 10 C. into a solution prepared from 12 kilos of 2,3-hydroxynaphthoic acid ethyl-ester, 350 ldlos of ethyl-alcohol, 12 kilos of crystalline sodium acetate and 500 grams of glacial acetic acid. When coupling is completed, the dyestufi is filtered and washed first with alcohol-and then with warm water. It dyes lacquers pure scarlet-red. shades of good fastness to light.

Ea'ample 4 4.65 kilos of 1-amino-2-nitrobenzene are diazotized as usual andthe filtered diazo solution 1s added to a solution prepared from 13 kilos of 2,3-hydroxynaphthoic acid amyl-ester, 500 kilos of ethyl-alcohol, kilos of crystalline sodium acetate and 500 grams of glacial acetic acid. When coupling is completed, the dyestuff is worked up as described in Example 3. It dyes lacquers pure scarlet-red shades of remarkable fastness to light.

Ewample 5 A filtered diazo-solution prepared from 4.65 kilos of l-amino-Z-nitrobenzene is allowed to run into a solution prepared from 12 kilos of 2,3-hydroxynaphthoic acid ethyl-ester, 250 kilos of ethyl-alcohol, 12 kilos of crystalline sodium acetate. and 500 grams of glacial acetic acid. When coupling is completed, the dyestuff is worked up as indicated in Example 3. It dyes lacquers pure scarlet-red shades of remarkable fastness to light.

Example 6 A filtered diazo-solution prepared from 10.5 kilos of 1-amino-2-nitrobenzene-4-carboxylic acid ethyl-ester is allowed to run into a solution prepared from 12 kilos of 2,3-hydroxynaphthoic acid ethyl-ester, 300 kilos of ethyl-alcohol, 12 kilos of crystalline sodium acetate and 500 grams of glacial acetic acid. When coupling is completed, the dyestufi is worked up in the usual manner. It dyes lacquers pure bluish-red shades which are fast to light.

What I claim is:-

1. A process for the manufacture of monoazo dyestuffs insoluble in water, comprising coupling a diazo-compound of an ortho-nitraniline of the general formula:

IIIH:

wherein R may stand for hydrogen, N02, CH3, OCzHs or COOCzHs, with an alkyl-ester of 2,3- hydroxynaphthoic acid.

2. A process for the manufacture of monoazo- 2 dyestufls'insoluble in water, comprising coupling a diazo-compound of an ortho-mtraniline of the general formula:

IIIH:

V wherein R may stand for hydrogen, N02, CH3

OC2H5 or COOCzHs, with the ethyl-esterpf 2,3-

I hydroxynaphthoic acid.

dyestuffs insoluble in water, comprising coupling a diazo-compound of. 1 amino-Z l-dinitrobenzene with'an alkyleester of 2;3-hydroxyn'aphthoic acid.

5; A process for the manufacture of monoazodyestuffs insoluble in water, comprising coupling a diazo-compound of 1-amino-4-methy1-2-nitrobenzene with an alkyl-ester of 2,3-hyd roxynaphthoic acid.

6. The water insoluble mon'oazodyestufls froma diazo-compound of an ortho-nitraniline 01' the general formula:

fwhe reinR my stand for hydrogen, N02, cm.

0021-15 or COOCzI-Is, and a 2,3-hydroxynaphthoic acid alkyl-ester, having Pure, bright yellow-red to blue-red shades and being owing to their remarkuseful' in the varnish industry. 7

Acnnm able fastness to light and to acids particularly a 

